Focusing attachment.



'No.fsvmo PATENTED DB0. 16,1907.

E. S. BALLOU.

POGUSING ATTACHMENT. APPLGATION FILED un. 17, 1907.

. To all whom it W'uvy concern:

i UNiTEn sfrA'rEs rATENT oFFioE;

ianxnsr s. BALLoU, or uns MoiNEs, iowa.

FOCUSING ATTACHIENT.

` Be it known that I, ERNEST S. BALLoU, a citizen of the United States, residing at Des Moines, in the county of Polk and State of Iowa, have invented certain new and useful Improvements in Focusing. Attachments;

`and I do declaie the following to be a full, clear, and exact description of tl'ie invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to ments forcameras, and has for its object to provide a device of this kind vfliicli can be formed upon or connected With any ordinary camera, and is for the purpose of permitting the apparatus'to be focused while the sensi-` tive plate is in condition for instant exposure,

thereby permitting a snap shot picture being taken immediately upon the focusing of 1 the instrument. The accompanying drawings illustrate the invention, in which,

Figure 1 is a longitudinal sectional view of a camera provided with one form of my improved focusing mechanism Fig. 2 is a broken perspective view of the front end of the saine, showing the means for connecting it with the lens of the instrument; Fig. 3 is a view of the same.

Referring more particularlyT 4to the vdrawings, which are for illustrative purposes only and are therefore not drawn to scale,-the numeral 1 indicates a camera of any suitable construction, the bellows of lwhich is connected with the lens mechanism 2 in'any suitable lplan view of the finder; Fig. 4 is a sectional y any suitable manner.

The numeral 3 indicates Athe main frame work of the finder mechanism, which can be formed as a part of the camera or of an attachment adapted to be secured thereto, in

Mounted dia onally VWithinlthe frame 3 is a reflector 4, a ove which is located a suitable ground glass 5 of the finder, upon which is seen the image of the object to be focused, said image bein a duplicate of what will appear upon the m ..6'af ter the exposure has been made. A folding shield 7 is preferably arranged on the box ormain frame 3 so as to make the im eupon 5 stand out more clearly, in the wellg own manner.

Connected with the forward end of the' box of frame 3 is a suitable bellows 8, which is connected at its forward end with th? lens Specification of Letters Patent:

Application filed January 17. 1907. Serial No. 352,783.

focusing attachl Patented Dec. 10', 1907.

l mechanism 2 in any suitable manner, preferably b v means of the lens supporting legs 9, which are extended upwardly, as shown at 10. Two cross bars 11 are mounted upon the extensions 10, betvi een which is secured a suit-able focusing lens 12. This lens is of the same poner as the lens of the camera, but need not be of the same quality, whereby the vimages that are formed by the two lenses Will be duplicates, as above referred to. The lens 12 isadjustable vertically so that its ator can properly focus and locate the image as desired, by observing the glass 5 as fromtlie camera and the ordinary focusing .plate substituted therefor. i l For the purpose of determining the exact area of the picture or image that willappear upon the negative, the opening in the frame orisupport'5 for the glass 5. is preferably made rectangular, as shown in Fig. 3, and

the frame is mounted 'in a circular groove or j channel 13, and provided with a projection l 14, by means of which the frame can be rotated so as to cause the glass to stand length- Wise of the top of the frame 3 as shown in Fig. 3, or transversely to it, as Will be underi stood. The under surface of the frame 5 is preferably corrugated to hold it in any set provided with marks 15, which arecaused to register 'with similar marks 16 on the frame inthe desired position.

With a device as above described it is evicamera may be placed in condition for instant exposure and the camera opened in the usual manner vready for adjustment. The operator can then proceedto focus the instrument, and as soon as that has been done, as'will be indicated bythe finder, the shutter maybe actuated, and a picture taken instantly, thereby securing the' desired result Without the possibility of disarrangement of the focus or movement of the object, which is liable to loccur if the plate or film must be lprepared for exposure after the focusing has een done,`as With ,the ordinary camera. shown in the drawings, the attachment will add but little 'to the .A size of the ordinary camera, owing to the. ability to lace the glass' of the finder in a horizonta position uponone side and arranging the'reflector at axis can aluays be kept parallel with the axis of the camera lens 'whereby the operthough the lilm or plate 6 were removed- 3, and thereby indicate When the frame 5 is l dent that the negative upon the inside of the position, and the upper surface is preferably closed in theusual manner.

down over the glass of the finder, and the lens mechanism collapsed or pushed back into vthe box of the camera and thet front When it is desired to again make an exposure', the camera isl opened in the ordinary manner and the lens. mechanism pulled outward which will at the same time move forward the finder lens 12, and by opening the shield, the instrufor operation. YVhen con.

ment 1s readr structed in this manner, the ordinary finder may be ensed with.

Althoug I have shown what I consider i the most desirable form for constructing' my invention, it is evident that changes .and

- modifications may be lmade therein,and I reserve the right to make all such variations as willv come Within the scope of the invention as Vset forth in the appended claims.Y

Havingdescribed my invention, I claim:- 1; In combination with a camera having upwardly-extending, lens-supporting/leg an circular groove and provide of cross-bars adjustablyg/rnounted' on said legs, a lensslggorted between said bars, a bellows connec with the frame and with the' lens sup rt, an inclined reflector A in the frame at t rear of the bellows, a ground lass in the frame above the reflector, and afoI cover for the ground glass.

2. In com ination with a camera, a frame thereon, the top of whichis rovided with a with marksba circular frame rotatabl mounted in said groove, the under face o which is corrugated and the outer face rovided with marks adapted to register wlth the marks on the frame, the circular frame being provided with an elongated rectangular ope a ound glass in said opening, an incline relector below said ground lass, means for throwing an image on the re eetor,and a pin in the circular frame for rotatinghit.

In testimony whereof I have ereunto set my hand presence of two subscribing wit 

